TM 1-1500-204-23-11
1
Apply non-porous release ilm on
10 Seal the assembly in a vacuum bag.
the layup tool/part surface. Ensure
Apply full vacuum (≥20 inches of mer-
release ilm is 1 inch larger than the
cury) to the bag.
largest ply of the laminate. If a heat
blanket is used, release ilm should
extend one inch beyond edge of heat
blanket. Tape in place.
Failure to properly cure adhesive in accor-
dance with the speciied cure cycle will result in
Apply the debulked laminate to the
2
reduced repair strength may not be detectable
release ilm at the required location
by visual or nondestructive inspection. This
on the layup tool/part. Heat lamp(s)
may result in loss of structural integrity.
operating at 110 10 F may be used
to assist in forming the laminate to the
layup tool/part.
11 Heat at 3-5 F per minute to the tem-
perature and time from the system
Position at least two monitoring ther-
3
speciic technical manual or table 7-6.
mocouples around the perimeter of
the laminate and tape in place. (Do
12 Hold at the temperature for the time
not place the thermocouples on the
from the system speciic technical
laminate stack).
manual or table 7-6. Begin timing
when coldest thermocouple reaches
Connect the thermocouples to a tem-
4
the minimum temperature tolerance.
perature measuring device/vacuum
Maintain a minimum of 20 inches of
controller.
mercury vacuum on the vacuum bag.
Place a layer of non-porous release
5
13 Cool to 140 F while maintaining a
ilm over the laminate the same size
minimum of 20 inches of mercury. Do
as in step 1 above.
not exceed a cool down rate of 5 F
per minute.
NOTE
14 Release vacuum and debag part.
Refer to paragraph 6-18 for vacuum bag and
heat blanket installation.
15 Perform NDI of laminate as described
in paragraph 5-2 and the system spe-
Cover the layup with a 0.020 inch
6
ciic technical manual.
thick aluminum or copper sheet.
b. Method 2: Cocuring to Part. This method is
7
Cover with a heat blanket and tape in
used to simultaneously cure the laminate and the
place.
adhesive to the part surface. See igure 7-68. Patch
may be cocured to the part needing repair, in which
8
Place a control thermocouple on top
case a layer of paste adhesive (as speciied in the
of the heat blanket over the center of
system speciic technical data) should be used. Cure
the repair.
according to the cure cycle speciied in the system
9
Cover with 2 layers of breather cloth.
speciic technical manual or table 7-6.
7-112